Let the printer work over night...seems I haven't tightened enough the PTFE tube in the heatsink...so it eventually popped out....cleaned everything inserted a new nozzle...and forgot to tighten the nozzle again after heating up.....so starting again from beginning (o;

If I want to replace the nozzle again I have to pull out the PTFE from the heatsink...where it is hold by a some sort of washer which prohibits pulling....